Deep under Toad Town in Paper Mario is a sewer system called the Toad Town Tunnels. It's a massive series of passages with Warp Pipes that connect to all the levels in the game, with the exception of Flower Fields. The main pipe to the tunnels is in the area of Toad Town with Tayce T.'s house and the entrance to Forever Forest. The secondary entrance/exit is in the blue house above the main entrance.